1078128869 has 2 divisors, whose sum is σ = 1078128870. Its totient is φ = 1078128868.

The previous prime is 1078128851. The next prime is 1078128871. The reversal of 1078128869 is 9688218701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1073872900 + 4255969 = 32770^2 + 2063^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1078128869 is a prime.

It is a super-2 number, since 2×1078128869² = 2324723716342438322, which contains 22 as substring.

Together with 1078128871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1078128839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 539064434 + 539064435.

It is an arithmetic number, because the mean of its divisors is an integer number (539064435).

Almost surely, 2^1078128869 is an apocalyptic number.

It is an amenable number.

1078128869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1078128869 is an equidigital number, since it uses as much as digits as its factorization.

1078128869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 50.

The square root of 1078128869 is about 32834.8727574815. The cubic root of 1078128869 is about 1025.3927090103.

The spelling of 1078128869 in words is "one billion, seventy-eight million, one hundred twenty-eight thousand, eight hundred sixty-nine".